ZF and ZFD Scroll Compressor Ranges for Low Temperature Refrigeration

Emerson developed the ZF range to provide the best performance in low temperature. The range has a wide application envelope as it can operate from -40°C evaporating temperature to +7°C. They have been optimized in their design to perfectly fit frozen food application requirements. Thanks to their scroll compliance mechanism, these scroll compressors feature particularly high tolerance to liquid slugging.

The range consists of:

The ZF*K4E models that operate with liquid injection in order to control discharge temperature and increase the operating envelope.
The ZF*KVE models that are optimized for vapor injection with use of a sub-cooler. This boosts refrigeration system’s cooling capacity and efficiency.
The Summit ZF*K5E models that operate both with liquid injection or vapor injection.

These compressors are qualified for R407A/F, R448A/R449A, R404A and R134a for certain models.

ZFD Digital Scroll Compressors

Based on the unique Copeland compliant scroll design, the digital modulation operates on a simple mechanism. Capacity control is achieved by separating the scroll sets axially over a small period of time. It is a simple mechanical solution allowing precise temperature control and system efficiency and it requires no other components.
Digital scroll technology provides continuous, stepless modulation from 10% to 100% with no operating envelope restriction. As a result, system pressures and temperatures are tightly controlled. These compressors provide optimum performance for refrigeration units, refrigeration packs, process and agricultural units.

Features and Benefits

Wide operating envelope with 10°C low condensing temperature to minimize energy consumption
One model for multiple refrigerants
Light weight and compactness, up to half the weight of equivalent semi-hermetic compressor
Optional sound shell allowing up to 10 dBA sound attenuation
ZF models with liquid injection - Easy, efficient and reliable injection via Discharge Temperature Control valve (DTC)
ZF models with enhanced vapor injection - Seasonal efficiencies compared to Emerson’s best semi-hermetic compressors
Improved system capacity and efficiency by 40% and 25% respectively, making them the most efficient compressors on the market.
Possibility to reduce the equipment and component sizes by using smaller compressors